Meaning of dead center

dead' cen'ter

Pronunciation: [key]
— Mach. Mach.
  1. Also called(in a reciprocating engine) either of two positions at which the crank cannot be turned by the connecting rod, occurring at each end of a stroke when the crank and connecting rod are in the same line.
  2. See under(def. 19a).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.